#include<string.h>
#include<stdio.h>
#define op_t unsigned long int

int main()
{
  int i = 0;
  struct
  {
    int a;
    char s[5];
    float f;
  }tt;

  char s[50];

  bzero(&tt,sizeof(tt));
  bzero(s,20);
  for(i = 0;i<20;i++)
    printf("%d",s[i]);

  printf("\n");
  printf("%d",tt.a);
  printf("\n");
  printf("%f",tt.f);
  printf("\n");

  printf("%d",sizeof(op_t));
  printf("\n");
  printf("%d",sizeof(unsigned int));
  printf("\n");

  printf("%d\n",s);
  printf("%d\n",&s[19]);

  return 0;
}
